Pressure-screw



E. w. MENGER.

PRESSURE SCREW. APPLICATION FILED JUNE 24. 1921.

1,387,996. Patehted Aug. 16, 1921.

INVENTOR which the foll a'aassuas-scasw.

' appaenm filed 311118'35,

To all whom it may concern;

Be it known that I, EDWARD W. Manama, a citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented certain new and useful Improvements in Pressure-Screws, of

owing is a specification.

This invention relates to pressure screws employed in C-clamps screw presses, lathes," lifting jacks and the like.

u important object is to provide a pressure screw having a sphere shaped bearing located betweenits forward end'and the bottom wall of the socket formed in the shoe so that the screw is capable of free rotation with relation to the shoe and so that the shoe may partake of a slight pivotal movement When necessary.

A further object is to provide novel means whereby the aforesaid bearin may Y be readily renewed and lubricated f hr the purpose of reducing. friction to a minimum.

further object of the invention is to provide a feed screw which is efiicient, durable in use and cheap to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing formin a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of the improved pressure screw used in connection with a clam Fig. 2 is a dbtail sectional view through the screw. 0

Fig. 3 is a perspective of a, shoe embodled in the invention.

Fig. 4 is a perspective of a modified form of shoe employed under certain conditions.

Fig. 5 is a detail sectional view through 4 the pressure screw.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 designates a clamp in connection with which the pressure screw 6 is used. It is understood, however, that the pressure screwforming the subject matter of this application is not restricted to use in connection with a clamp of the type illustrated but is capable of use in connection with lathe work, screw presses, lifting jacks, etc. I

The improved pressure screw is provided with a head 7 having its forward end prospeciflcatlon of Letters Patent. Patented I Aug. is, 1921. 1921. serial No. 480,174. I

vided with .an annular rounded rib 8 re-' ceived within an annular groove 9 formed intermediate the ends of a socket 10 formed in a shoe 11. With reference to Fig. 3 in partlcular, it will be noted that the'shoe 11 1s formed with a urality of spaced parallel incisions 12 which'define an annular series of spring) arms 13 rearwardly of the rib 8 and thereby hold the rib 8 in the annular groove 9. In carrying out theinvention, the head 7'is formed with a socket 15 which receives a portion of a sphere shaped bearing 16, the said bearing also being partially received in a socket or of the feed or pressure screw is spaced-from the bottom wall of the socket 10 thereby.

forming which engage the head 7 whereb the bearing 16 and the adjacent faces 0 the socket 10 and the head 7 may be maintained in a well lubricated condition for the purpose of reducing friction and wear to a minimum. Should the bearing 16 become broken the same may be removed b slipping the shoe ll ofi the forward end 0 the pressure screw thereby exposing the bearing. As the sides of the earing 16 .are spaced from contact with the sides of th transmitted directly to the forward end of t e shoe. In the form of the inventionillustrated in Fig. 4 the shoe 11 is formed at its forward end with a V-shaped socket 20 so that the pressure screw may be used in lathe work when turning shafts and the like. 1

With referenceto the foregoing descriptionv taken in connection with the accompanying drawing it will be apparent that by reason of the connection between the screw and the shoe, the screw is prevented from crystallizing as the result of continual use. Further, friction is reduced to a minimum so that the screw may be operated with but a small effort on the part ofthe operator.

I claim j 1. A pressure screw comprising a body having its forward end provided with a e socket 10 the thrust is head and an annular rib, a shoe having a socket receiving said head and having yieldable side walls provided with a groove receivingsaid rib, and a sphere shaped bearing confined between the bottom wall of said socket and the forward end of said head.

2. A pressure screw comprising a body having its forward end provided with a head and an annular rib, a shoe having a socket receivin said head and havin a side Wall provider with a groove-receiving said rib, and a sphere shaped bearing confined between the bottom wall of said socket and the forward end of said head, the bottom wall of said socket and the forward end of said head being provided with recesses receiving the adyacent portions of said bearing. 3. A pressure screw COIHPIISIIIg a having its forward end provided with a head 20 and an annular rib, a shoe having a socket body "aaeaeoe v detachably receiving said head and having a side wall provided witha groove receiving said rib, and a sphere shaped bearing confined between the bottom wall of said socket and the forward end of said head, the bottom wall of said socket and the forward end of said head being provided with recesses receiving the adjacent portions of said bearing, the forward end of said head being spaced from the bottom wall of said socket and the sides of said bearing being spaced from the side walls of said socket thereby forming an oil receiving space.

In testimony whereof, I have aifixed my signature in the presence of two witnesses.

EDWARD W. MENGER.

Witnesses: I

T. J Mnivonn, R. W. MENGER. 

